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I am using sand from the beach (indian ocean) that i got when i was travelling. It smaller than 1mm. The waste always stay on top and it is super easy to clean. I only siphon with a hose about 2 to 3 inches from the sand. Only the waste get pulled out.

I'm looking to add some coral sand to my Troph/Petro tank and wondered what size grain of sand people are using. Advertised sizes are 1mm 3mm 5mm and 10mm.

Of the sizes that you stated, 1 & 3mm will be the most sand like. still course though and very easy to vacume. After you vacume it several times you will have all the dust out and it will be very easy to vacume and not cloud the water. Wash well at first of course.

5mm and 10mm will begin to look like crushed coral gravel. And will work really well to vacume but I like for the fish to be able to pick through the sand and spit it out etc.

So the 1mm would be what I got if I were you...maybe a mix with the 3mm.

And at that size, trophs will be able to sift through it easily.

One thing that always made me wonder was how the guys with the sugar sand could stand it with the trophs sifting it. IT would alway be in the water.

With 1mm...the pick it up and spit it out and it falls quickly back down to the bottom with no dust after washed.